diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1d1bc31..fa463bf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,25 @@ All notable changes to this module will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this module adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.0.0] — 2026-05-12
+
+### Added
+
+- JSON tag name resolution — field names in error context now use the `json`
+  struct tag when available (e.g. `"email_address"` instead of `"EmailAddress"`),
+  falling back to the Go field name when no json tag is defined or the tag is `"-"`.
+
+### Changed
+
+- `xerrors` dependency bumped from v0.9.0 to v1.0.0.
+
+### Unchanged
+
+All existing API (`Validator`, `New`, `WithMessageProvider`, `MessageProvider`,
+`DefaultMessages`, `SpanishMessages`) is API-compatible with v0.9.0.
+
+[1.0.0]: https://code.nochebuena.dev/go/valid/releases/tag/v1.0.0
+
 ## [0.9.0] - 2026-03-18
 
 ### Added
diff --git a/go.mod b/go.mod
index 344b30a..478f74b 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module code.nochebuena.dev/go/valid
 go 1.25
 
 require (
-	code.nochebuena.dev/go/xerrors v0.9.0
+	code.nochebuena.dev/go/xerrors v1.0.0
 	github.com/go-playground/validator/v10 v10.30.1
 )
 
diff --git a/go.sum b/go.sum
index 7488def..c790e50 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,5 @@
-code.nochebuena.dev/go/xerrors v0.9.0 h1:8wrDto7e44ZW1YPOnT6JrxYXTqnvNuKpAO1/5bcT4TE=
-code.nochebuena.dev/go/xerrors v0.9.0/go.mod h1:mtXo7xscBreCB7w7smlBP5Onv8H1HVohCvF0I/VXbAY=
+code.nochebuena.dev/go/xerrors v1.0.0 h1:si24SFGa7cHwAxbu75AAEB+a3qRmF118F/BM2SFI7VI=
+code.nochebuena.dev/go/xerrors v1.0.0/go.mod h1:mtXo7xscBreCB7w7smlBP5Onv8H1HVohCvF0I/VXbAY=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/gabriel-vasile/mimetype v1.4.12 h1:e9hWvmLYvtp846tLHam2o++qitpguFiYCKbn0w9jyqw=
diff --git a/valid.go b/valid.go
index f0aaf4f..45f160a 100644
--- a/valid.go
+++ b/valid.go
@@ -2,6 +2,8 @@ package valid
 
 import (
 	"errors"
+	"reflect"
+	"strings"
 
 	"code.nochebuena.dev/go/xerrors"
 	playground "github.com/go-playground/validator/v10"
@@ -33,13 +35,23 @@ func WithMessageProvider(mp MessageProvider) Option {
 }
 
 // New returns a Validator. Without options, DefaultMessages (English) is used.
+// Field names in error context use the json struct tag when available,
+// falling back to the Go field name.
 func New(opts ...Option) Validator {
 	cfg := &config{mp: DefaultMessages}
 	for _, o := range opts {
 		o(cfg)
 	}
+	v := playground.New()
+	v.RegisterTagNameFunc(func(fld reflect.StructField) string {
+		name := strings.SplitN(fld.Tag.Get("json"), ",", 2)[0]
+		if name == "" || name == "-" {
+			return fld.Name
+		}
+		return name
+	})
 	return &validator{
-		v:  playground.New(),
+		v:  v,
 		mp: cfg.mp,
 	}
 }